Question

Ribophorins/SRP receptors are required for

• A. Synthesis of ribosomes in nucleolus
• B. Attachment of ribosomes over R.E.R.
• C. Attachment of ribosome subunits
• D. Attachment of mRNA to ribosomes for protein synthesis

Answer 1

Answer: (B)

Attachment of ribosomes over R.E.R.

• Signal recognition particle or SRP receptor which is associated with the rough endoplasmic reticulum.
• It is also known as docking protein (dimer made up of 2 different subunits).
• Its main function is to identify the targets specific proteins to the endoplasmic reticulum (eukaryotes) and the plasma membrane (prokaryotes).
  
• Ribophorins is a glycoprotein located on the membrane of the rough endoplasmic reticulum.
• It helps in attachment of ribosome units over the RER.
  
• So, the correct answer is 'Attachment of ribosomes over R.E.R'.